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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities At December 31, 2018, marketable securities consisted of the following (in thousands):
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Aggregate Fair Value
U.S. treasury securities | $ | 65,491 |  |  | $ | 2 |  |  | $ | (4 | ) |  | $ | 65,489 |
Corporate bonds | 19,708 |  |  | 15 |  |  | (3 | ) |  | 19,720 |
Commercial paper | 11,894 |  |  | — |  |  | — |  |  | 11,894 |
Short-term investments | $ | 97,093 |  |  | $ | 17 |  |  | $ | (7 | ) |  | $ | 97,103 |
U.S. treasury securities | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |
Commercial paper | 6,635 |  |  | — |  |  | — |  |  | 6,635 |
Money market funds | 15,223 |  |  |  |  |  |  | 15,223 |
Cash equivalents | $ | 22,858 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,858 |
Total marketable securities | $ | 119,951 |  |  | $ | 17 |  |  | $ | (7 | ) |  | $ | 119,961 |
All marketable securities of at December 31, 2017 of $22.1 million consisted of money market funds which were classified as cash equivalents.

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